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Present status of the multi‐gear shrimp fishery off the west coast of S ri Lanka: gear‐based species diversity and selectivity
Author(s) -
Croos M. D. S. T.,
Pálsson S.
Publication year - 2013
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.2012.02043.x
Subject(s) - shrimp , fishery , fishing , biology , catch per unit effort , bycatch , penaeus , penaeidae , habitat , decapoda , crustacean , ecology
Summary Catch statistics were monitored from well established small‐scale shrimp fisheries in N egombo lagoon and the adjacent coast in western S ri L anka, in order to evaluate resource usage, gear selectivity, and spatio‐temporal dynamics of catches and CPUE . A total of 55 species, representing 35 families, including 13 shrimp species were recorded from 3546 samples obtained weekly during J anuary 2009‐ A pril 2010, for nine types of gear in six fishing grounds. Special emphasis was on shrimp catches: four main shrimp species, Metapenaeus dobsoni, F enneropenaeus indicus, P arapenaeopsis coromandelica and P enaeus semisulcatus, represented 82% of the total shrimp landings. Catch per unit effort ( CPUE ) differed among fishing grounds, months and gear types. Species diversity differed among the gear chosen. Hierarchical cluster analysis based on presence‐absence of the species data of catches showed that clustering was based on habitat rather than on the fishing gear. Species composition analysed with a Detrended Correspondence Analyses over months and fishing grounds showed a distinction of trawl gear from the remainder of the gear operated in the lagoon. The information presented is of importance for evaluation of the present status of the shrimp fishery and for developing management strategies based on the types of gear.